Tornado Watch 515

Issued

Jun 19, 2011, 6:10 PM CDT (23:10 UTC)

Expired

Jun 20, 2011, 1:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The North Platte radar (KLNX), 40 km from the middle of the area, began a volume at 23:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

70%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

95%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

95%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1299Jun 19, 3:52 PM CDT
• Mesoscale Discussion 1301Jun 19, 5:49 PM CDT
• Mesoscale Discussion 1303Jun 19, 5:58 PM CDT
• Mesoscale Discussion 1307Jun 19, 8:24 PM CDT

677 
WWUS20 KWNS 192314
SEL5
SPC WW 192314
NEZ000-200600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 515
NWS STORM PREDICTION CENTER NORMAN OK
610 PM CDT SUN JUN 19 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       SOUTHWEST THROUGH NORTH CENTRAL NEBRASKA

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 610 PM UNTIL
100 AM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF ONEILL
NEBRASKA TO 15 MILES SOUTH SOUTHEAST OF MCCOOK NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 511...WW 512...WW
513...WW 514...

DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH ALONG
LOW LVL CONFLUENCE ZONE FROM SW NEB NNE TO N CNTRL NEB.
INCREASINGLY MOIST SSELY LOW LVL FLOW E OF CONFLUENCE ZONE AND
PRESENCE OF 35-45 KT WSWLY TO SWLY DEEP SHEAR SUGGEST POTENTIAL FOR
SUPERCELLS WITH LARGE HAIL/HIGH WIND AND TORNADOES.  ACTIVITY SHOULD
EVOLVE INTO A COMPLEX MCS OR TWO BY MID TO LATE EVE...WITH EMBEDDED
SUPERCELLS CONTINUING TO POSE A RISK FOR SVR WEATHER AS UPR
DIFFLUENCE/LLJ CONTINUE TO INCREASE OVER REGION DOWNSTREAM FROM
STRONG UPR TROUGH NOW OVER UT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 23025.


...CORFIDI

Tornado Watches in Nebraska, 2011Every tornado watch in 2011

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.